The very best suggestion I and our cat gurus can give you is to read this site - www.catinfo.org
You will be amazed at the information on the site and will be switching your kitties to a grain free wet food quickly after reading.

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Assumptions do nothing but make an ass out of u and me.

We can stick our heads in the sand for only so long before it starts choking us. Face it folks. The pet population is bad ALL OVER THE WORLD!